import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class SelectTest {
    public static void main(String[] args) throws SQLException {
        //1.创建数据源
        DataSource dataSource= new MysqlDataSource();
        ((MysqlDataSource) dataSource).setURL("jdbc:mysql://127.0.0.1:3306/java110?characterEncoding=utf8&useSSL=false");
        ((MysqlDataSource) dataSource).setUser("root");
        ((MysqlDataSource) dataSource).setPassword("wql667788");
        //2.建立连接
        Connection connection= dataSource.getConnection();
        //3.构造SQL
        String sql="select * from classmates";
        PreparedStatement statement= connection.prepareStatement(sql);
        //4.将sql发送给服务器
        ResultSet resultSet=statement.executeQuery();
        while(resultSet.next()){
            int id= resultSet.getInt("id");
            String name=resultSet.getString("name");
            System.out.println("id="+id);
            System.out.println("name="+name);
        }
        //5.释放资源
        resultSet.close();
        statement.close();
        connection.close();
    }
}
